EP0344491A1 - Dispensing cartridge with a supply cylinder and an expulsion piston - Google Patents

Dispensing cartridge with a supply cylinder and an expulsion piston Download PDF

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Publication number
EP0344491A1
EP0344491A1 EP89108449A EP89108449A EP0344491A1 EP 0344491 A1 EP0344491 A1 EP 0344491A1 EP 89108449 A EP89108449 A EP 89108449A EP 89108449 A EP89108449 A EP 89108449A EP 0344491 A1 EP0344491 A1 EP 0344491A1
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EP
European Patent Office
Prior art keywords
piston
screw
cartridge
filling
outside
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Granted
Application number
EP89108449A
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German (de)
French (fr)
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EP0344491B1 (en
Inventor
Wilhelm A. Keller
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KELLER, WILHELM A.
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
    • B05C17/005—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
    • B05C17/00576—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes characterised by the construction of a piston as pressure exerting means, or of the co-operating container
    • B05C17/00579—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes characterised by the construction of a piston as pressure exerting means, or of the co-operating container comprising means for allowing entrapped air to escape to the atmosphere
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D83/00—Containers or packages with special means for dispensing contents
    • B65D83/0005—Containers or packages provided with a piston or with a movable bottom or partition having approximately the same section as the container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2205/00—Venting means
    • B65D2205/04—Venting means for venting during the initial insertion of a piston

Definitions

  • the invention relates to a discharge cartridge with a storage cylinder and sealingly displaceable delivery piston whose bottom surface facing the cartridge contents has radially extending, slot-shaped depressions which open into a closable vent hole leading from the center of the bottom surface to the outside.
  • Discharge cartridges with delivery pistons are used in a known manner to hold, store and process pasty to thin-bodied masses, which are usually conveyed by the plunger of a e.g. "Gun-shaped" discharge device - driven out through the cartridge mouth.
  • a e.g. "Gun-shaped" discharge device - driven out through the cartridge mouth When filling such cartridges, any air pockets inside the cylinders must be carefully avoided because they form an elastic "cushion" and thereby impair a precisely metered squeezing of the contents; Such air cushions are particularly disruptive when dispensing two-component masses from double cartridges, because the volume ratio between the components, which should exactly be observed, is then changed.
  • certain masses processed by means of discharge cartridges can tend to react with the moisture of the enclosed air during storage, as a result of which they harden prematurely and become unusable.
  • the object of the present invention is to design a discharge cartridge with a delivery piston in such a way that complete cylinder ventilation is ensured both with a low-viscosity as well as with a highly viscous filling compound, with a secure and permanent closure being achieved with little effort and also in automatic filling systems.
  • this object is achieved in that the aforementioned bottom surface of the dimensionally stable delivery plunger facing the cartridge contents is continuously deepened from the plunger edge to the vent hole and in that a plug screw sits in the vent hole, along the shaft of which at least one longitudinal groove runs in the bore, the longitudinal grooves being on the outside of the piston are surrounded by an annular sealing surface on the piston, which is intended as an axial seat for the screw head.
  • the filling process can be carried out reliably and unhindered in various common ways and with any filling materials. After filling and complete venting, all you need to do is tighten the screw against the sealing surface to create a secure, permanent seal.
  • a piston with a bottom surface recessed towards a central vent hole - but without radial depressions - is known in another context, namely in a so-called Dispenser for pasty masses (DE-OS 36 35 849). That piston, however, is not a delivery piston moved by external force, but only a displaceable closure member which follows the filling compound. The vent hole is also closed in this device by an axially press-fit plug.
  • the discharge cartridge 1 shown in FIG. 1 has a storage cylinder 3 with a mouth 4 and a dimensionally stable delivery piston 10 which can be moved and sealed in the cylinder 3.
  • An elastic ring seal 12 (so-called O-ring), which is inserted into an annular groove 11 of the delivery piston 10, expediently serves as the piston seal; however, an elastic sealing lip formed on the piston edge can also be provided, which rests against the inner wall of the cylinder 3 (not shown).
  • the cartridge content 2 is stored in the storage cylinder 3 and later pressed out through the mouth 4 when used. As can be seen from FIG.
  • the filling compound forms after filling, but before venting, in the case of a thin liquid a level surface 5 (dash-dotted lines), or in the case of a pasty mass it is delimited at the top by an irregular surface 6. It is important that regardless of the viscosity of the filling compound 2 or the shape of its surface, all air can escape under the bottom surface 13 of the piston 10.
  • This bottom surface 13 facing the cartridge content 2 is continuously deepened towards the center from the piston rim.
  • a vent hole 15 extends from the deepest point 14 of the bottom surface 13 (lying at the top in the illustrated position of the discharge cartridge), which leads through the piston to the outside.
  • this bore 15 there is a screw plug with shaft 16 and screw head 17. As shown, it can be a screw with a self-tapping thread and a Phillips head, and it can be tightened from the outside by means of a screwdriver 8.
  • the vent hole 15 has e.g. four longitudinal grooves 18, which run along the screw shaft 16, but outside the same.
  • the longitudinal grooves 18 are surrounded by an annular sealing surface 19 (e.g. an annular bead) on the outside of the piston 10, which is intended as an axial seat for the screw head 17.
  • the bottom surface 13 of the piston 10 then has a system of radially extending, slot-shaped depressions 20 which open at the vent hole 15 and thereby communicate with the longitudinal grooves 18 in this hole.
  • the piston 10 can expediently have a number of radial ribs 21 formed on the piston head 23. These form a recess 22 surrounding the sealing surface 19, which receives the screw head 17 when it is tightened.
  • the filling compound is introduced from below through the open mouth 4 and rises in the cylinder 3, while the delivery piston 10 is expediently still outside the cylinder.
  • the filling process comes to a standstill when a certain amount of the filling mass, measured by a metering device in the filling station (not shown), is in the cylinder 3, whereupon the mouth 4 is closed.
  • the delivery plunger 10 is then inserted into the cylinder 3 from above - preferably with a preassembled but not yet tightened screw 16, 17 (FIG. 1) - and pressed down against the filling compound 2 until all the air under the plunger passes through the Longitudinal grooves 18 has emerged.
  • the complete ventilation with full surface contact of the bottom surface 13 by the filling compound is clearly noticeable in the strongly increasing resistance to the pushing in of the piston at the moment when the filling compound is pressed through the narrow grooves 18, and finally can also be easily visually determined when the Mass begins to emerge from the grooves 18 above.
  • the screw is then tightened, the head 17 abutting the sealing surface 19 and closing all the longitudinal grooves 18.
  • the screw is tightened with only a small amount of force on the piston and without any significant volume displacement inside the cartridge.
  • the tightened screw forms a tight, reliably secured closure during distribution and storage of the filled cartridge.
  • the piston 10 is pushed through the plunger of a discharge device (not shown) and the contents are pressed out through the mouth 4, the countersunk screw head 17 (FIG. 3) remains unaffected by the mentioned plunger.
  • a filled liquid with a level surface 5 will hardly pose any difficulties in the present shape of the bottom surface 13: it will first touch the piston 10 at the edge and then continuously along the bottom surface 13 to the point 14 and then into the bore 15 penetrate while displacing the air.
  • a viscous filling compound 2 with a "heap-shaped", irregular surface 6, on the other hand will generally first touch the bottom surface 13 at other points (and often, as in the illustrated heap formation in a central area), air still being radially outside. In this case, the complete ventilation is still ensured thanks to the slot-shaped recesses 20.
  • This can be seen particularly from the greatly enlarged FIG. 5: thanks to the narrow, but relative deep cross section of the slots 20, "trapped" air located radially outside the contact points can nevertheless escape, since, according to FIG until the entire bottom surface 13 is touched by the filling compound.
  • the procedure can also be such that when the delivery piston 10 is not yet inserted into the cylinder 3, the contents of the cartridge are filled in from above in a measured amount (not shown).
  • the piston is then inserted into the cylinder 3 with the screw not yet or not fully screwed in and pressed against the filling compound 2.
  • the complete ventilation by pressing the piston 10 and the closing by tightening the screw is then carried out as described above.
  • the design of the delivery piston described allows particularly reliable and efficient venting of the cartridge cylinder after filling.
  • the processes of filling, venting and closing can also be automated without any particular difficulties.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
  • Coating Apparatus (AREA)

Abstract

When filling dispensing cartridges (1), having an expulsion piston (10) which is displaceable in a sealing manner in the supply cylinder (3), the inclusion of air in the cylinder above the contents (2) of the cartridge must be avoided. For this purpose, the bottom surface (13) of the piston facing the contents (2) is constantly recessed from the edge of the piston towards the centre and a venting borehole (15) extends from the lowest point (14) through the piston towards the outside. Seated in the borehole (15) is a closure screw, extending along the shaft (16) of which there are longitudinal grooves (18). The latter are surrounded by an annular sealing surface (19) which is intended as an axial seat for the screw head (17). When the screw is tightened, all the longitudinal grooves (18) are reliably closed. The filling, venting and closure can easily be automated in this design and the piston ring seal (12) is not impaired. Even viscous contents with an uneven surface (6) can be vented satisfactorily by a system of radial slots (20) on the bottom surface (13). <IMAGE>

Description

Die Erfindung betrifft eine Austragkartusche mit Vorratszylinder und darin abdichtend verschiebbarem Förderkolben, dessen dem Kartuscheninhalt zugekehrte Bodenfläche radial verlaufende, schlitzförmige Vertiefungen aufweist, die in einer von der Mitte der Bodenfläche nach aussen führenden, verschliessbaren Ent­lüftungsbohrung münden.The invention relates to a discharge cartridge with a storage cylinder and sealingly displaceable delivery piston whose bottom surface facing the cartridge contents has radially extending, slot-shaped depressions which open into a closable vent hole leading from the center of the bottom surface to the outside.

Austragkartuschen mit Förderkolben dienen in bekannter Weise zur Aufnahme, Lagerung und Verarbeitung von pastösen bis dünn­flüssigen Massen, die bei Vorschub des Förderkolbens - meist durch den Stössel eines z.B. "pistolenförmigen" Austraggerätes - durch die Kartuschenmündung ausgetrieben werden. Beim Füllen solcher Kartuschen müssen jegliche Lufteinschlüsse im Innern der Zylinders sorgsam vermieden werden, weil diese ein elasti­sches "Polster" bilden und dadurch ein genau dosiertes Auspres­sen des Inhalts beeinträchtigen; besonders störend sind solche Luftpolster beim Austragen von Zweikomponenten-Massen aus Doppel­kartuschen, weil dann das Volumenverhältnis zwischen den Kompo­nenten, welches genau eingehalten werden sollte, verändert wird. Ausserdem können gewisse mittels Austragkartuschen verarbeitete Massen dazu neigen, während der Lagerung mit der Feuchtigkeit der eingeschlossenen Luft zu reagieren, wodurch sie vorzeitig aushärten und unbrauchbar werden.Discharge cartridges with delivery pistons are used in a known manner to hold, store and process pasty to thin-bodied masses, which are usually conveyed by the plunger of a e.g. "Gun-shaped" discharge device - driven out through the cartridge mouth. When filling such cartridges, any air pockets inside the cylinders must be carefully avoided because they form an elastic "cushion" and thereby impair a precisely metered squeezing of the contents; Such air cushions are particularly disruptive when dispensing two-component masses from double cartridges, because the volume ratio between the components, which should exactly be observed, is then changed. In addition, certain masses processed by means of discharge cartridges can tend to react with the moisture of the enclosed air during storage, as a result of which they harden prematurely and become unusable.

Bei einer bekannten Austragkartusche der eingangs genannten Art ist die dem Kartuscheninhalt zugekehrte Bodenfläche des Förderkolbens konvex gewölbt (DE-OS 23 02 364). Hierbei können die radialen, schlitzförmigen Vertiefungen in der Bodenfläche nicht verhindern, dass - jedenfalls bei dünnflüssiger Füllmasse - am Kolbenrand Luft eingeschlossen bleibt, d.h. nicht durch die Entlüftungsbohrung entweichen kann. Der Verschluss dieser Bohrung erfolgt mittels eines axial verschiebbaren Stopfens, der auf einem Teil seiner Länge Entlüftungsnuten aufweist und am Ende des Füllvorgangs vollends in die Bohrung hinein getrieben werden muss. Um dabei einen dauerhaften, dichten Verschluss (Pressitz) zu erzielen, müssen jedoch auf den Stopfen erhebliche Kräfte ausgeübt werden. Dennoch ist der Stopfen axial nicht gesichert, was aber unbedingt notwendig wäre, weil die Bohrung durch den Kartuscheninhalt eine "Schmierung" erfährt.In a known discharge cartridge of the type mentioned, the bottom surface of the cartridge facing the cartridge Delivery piston convexly curved (DE-OS 23 02 364). Here, the radial, slot-shaped depressions in the bottom surface cannot prevent air from being trapped at the piston rim, at least in the case of a low-viscosity filling compound, ie cannot escape through the ventilation hole. This bore is closed by means of an axially displaceable stopper which has ventilation grooves over part of its length and which must be driven completely into the bore at the end of the filling process. In order to achieve a permanent, tight seal (press fit), however, considerable forces must be exerted on the stopper. Nevertheless, the plug is not axially secured, which would be absolutely necessary because the bore is "lubricated" through the cartridge contents.

Aufgabe der vorliegenden Erfindung ist es, eine Austragkartusche mit Förderkolben so zu gestalten, dass eine vollständige Zylin­derentlüftung sowohl mit dünnflüssiger wie auch mit hochviskoser Füllmasse gewährleistet ist, wobei ein sicherer und dauerhafter Verschluss mit nur geringem Kraftaufwand und auch in automati­schen Abfüllanlagen erzielt werden soll. Erfindungsgemäss wird diese Aufgabe dadurch gelöst, dass die genannte, dem Kartuschen­inhalt zugekehrte Bodenfläche des formsteifen Förderkolbens vom Kolbenrand zur Entlüftungsbohrung hin stetig vertieft ist und dass in der Entlüftungsbohrung eine Verschlussschraube sitzt, entlang deren Schaft mindestens eine Längsnut in der Bohrung verläuft, wobei die Längsnuten an der Aussenseite des Kolbens von einer ringförmigen Dichtfläche am Kolben umgeben sind, welche als axialer Sitz für den Schraubenkopf bestimmt ist. Dadurch lässt sich der Abfüllvorgang auf verschiedene gebräuchliche Arten und mit irgendwelchen Füllmassen zuverlässig und ungehindert durchführen. Nach dem Füllen und der vollständigen Entlüftung braucht lediglich die Schraube gegen die Dichtfläche festgezogen zu werden, um einen gesicherten, permanenten Verschluss herzustellen.The object of the present invention is to design a discharge cartridge with a delivery piston in such a way that complete cylinder ventilation is ensured both with a low-viscosity as well as with a highly viscous filling compound, with a secure and permanent closure being achieved with little effort and also in automatic filling systems. According to the invention, this object is achieved in that the aforementioned bottom surface of the dimensionally stable delivery plunger facing the cartridge contents is continuously deepened from the plunger edge to the vent hole and in that a plug screw sits in the vent hole, along the shaft of which at least one longitudinal groove runs in the bore, the longitudinal grooves being on the outside of the piston are surrounded by an annular sealing surface on the piston, which is intended as an axial seat for the screw head. As a result, the filling process can be carried out reliably and unhindered in various common ways and with any filling materials. After filling and complete venting, all you need to do is tighten the screw against the sealing surface to create a secure, permanent seal.

Ein Kolben mit gegen eine mittige Entlüftungsbohrung hin ver­tiefter Bodenfläche - jedoch ohne radiale Vertiefungen - ist in anderem Zusammenhang bekannt, nämlich bei einem sogenannten Spender für pastöse Massen (DE-OS 36 35 849). Jener Kolben ist allerdings kein durch äussere Krafteinwirkung bewegter Förder­kolben, sondern nur ein verschiebbares Verschlussorgan, welches der Füllmasse folgt. Die Entlüftungsbohrung wird auch bei diesem Gerät durch einen axial einzupressenden Stopfen verschlossen.A piston with a bottom surface recessed towards a central vent hole - but without radial depressions - is known in another context, namely in a so-called Dispenser for pasty masses (DE-OS 36 35 849). That piston, however, is not a delivery piston moved by external force, but only a displaceable closure member which follows the filling compound. The vent hole is also closed in this device by an axially press-fit plug.

Nachstehend wird ein Ausführungsbeispiel einer erfindungsgemässen Austragkartusche im Zusammenhang mit der Zeichnung näher erläu­tert.

  • Fig. 1 zeigt die gefüllte Kartusche mit dem Förderkolben im Längsschnitt,
  • Fig. 2 zeigt in einem grösseren Massstab einen Schnitt ent­lang der Linie II-II in Fig. 1,
  • Fig. 3 zeigt, ebenfalls in grösserem Massstab, eine Partie der Fig. 1 in geschlossenem Zustand, d.h. mit festge­zogener Verschlussschraube,
  • Fig. 4 ist die (hälftige) Ansicht der Kolben-Bodenfläche, und
  • Fig. 5 zeigt stark vergrössert einen Ausschnitt des Kolbens entlang der Linie V-V in Fig. 4 im Kontakt mit der Füllmasse.
An exemplary embodiment of a discharge cartridge according to the invention is explained in more detail in connection with the drawing.
  • 1 shows the filled cartridge with the delivery piston in longitudinal section,
  • 2 shows, on a larger scale, a section along the line II-II in FIG. 1,
  • 3 shows, also on a larger scale, a portion of FIG. 1 in the closed state, ie with the screw plug tightened,
  • Fig. 4 is the (half) view of the piston bottom surface, and
  • FIG. 5 shows a greatly enlarged section of the piston along the line VV in FIG. 4 in contact with the filling compound.

Die in Fig. 1 dargestellte Austragkartusche 1 weist einen Vor­ratszylinder 3 mit Mündung 4 und einen im Zylinder 3 abdichtend verschiebbaren, formsteifen Förderkolben 10 auf. Als Kolbendich­tung dient zweckmässigerweise eine elastische Ringdichtung 12 (sogenannter O-Ring), welche in eine Ringnut 11 des Förderkol­bens 10 eingelegt ist; es kann aber auch eine am Kolbenrand angeformte, elastische Dichtlippe vorgesehen sein, welche gegen die Innenwand des Zylinders 3 anliegt (nicht dargestellt). Der Kartuscheninhalt 2 wird im Vorratszylinder 3 gelagert und später bei Verwendung durch die Mündung 4 ausgepresst. Wie aus Fig. 1 ersichtlich, bildet die Füllmasse nach dem Einfüllen, jedoch vor der Entlüftung, im Falle einer dünnen Flüssigkeit eine ebene Niveaufläche 5 (strichpunktiert eingezeichnet), oder sie ist im Falle einer pastösen Masse oben durch eine unregel­mässige Fläche 6 begrenzt. Es ist wichtig, dass unabhängig von der Viskosität der Füllmasse 2 bzw. von der Gestalt ihrer Oberfläche sämtliche Luft unter der Bodenfläche 13 des Kolbens 10 entweichen kann. Diese dem Kartuscheninhalt 2 zugekehrte Bodenfläche 13 ist vom Kolbenrand gegen die Mitte hin stetig vertieft. Von der tiefsten Stelle 14 der Bodenfläche 13 (bei der dargestellten Lage der Austragkartusche oben liegend) geht eine Entlüftungsbohrung 15 aus, welche durch den Kolben hindurch nach aussen führt. In dieser Bohrung 15 sitzt eine Verschlussschraube mit Schaft 16 und Schraubenkopf 17. Wie dargestellt, kann es sich um eine Schraube mit selbstschneidendem Gewinde und Kreuzschlitzkopf handeln, wobei sie mittels Schraubendreher 8 von aussen festgezogen werden kann.The discharge cartridge 1 shown in FIG. 1 has a storage cylinder 3 with a mouth 4 and a dimensionally stable delivery piston 10 which can be moved and sealed in the cylinder 3. An elastic ring seal 12 (so-called O-ring), which is inserted into an annular groove 11 of the delivery piston 10, expediently serves as the piston seal; however, an elastic sealing lip formed on the piston edge can also be provided, which rests against the inner wall of the cylinder 3 (not shown). The cartridge content 2 is stored in the storage cylinder 3 and later pressed out through the mouth 4 when used. As can be seen from FIG. 1, the filling compound forms after filling, but before venting, in the case of a thin liquid a level surface 5 (dash-dotted lines), or in the case of a pasty mass it is delimited at the top by an irregular surface 6. It is important that regardless of the viscosity of the filling compound 2 or the shape of its surface, all air can escape under the bottom surface 13 of the piston 10. This bottom surface 13 facing the cartridge content 2 is continuously deepened towards the center from the piston rim. A vent hole 15 extends from the deepest point 14 of the bottom surface 13 (lying at the top in the illustrated position of the discharge cartridge), which leads through the piston to the outside. In this bore 15 there is a screw plug with shaft 16 and screw head 17. As shown, it can be a screw with a self-tapping thread and a Phillips head, and it can be tightened from the outside by means of a screwdriver 8.

Wie vor allem aus den Fig. 2 und 3 hervorgeht, weist die Entlüf­tungsbohrung 15 z.B. vier Längsnuten 18 auf, die entlang dem Schraubenschaft 16, jedoch ausserhalb desselben verlaufen. Die Längsnuten 18 sind von einer ringförmigen Dichtfläche 19 (z.B. einem Ringwulst) aussen am Kolben 10 umgeben, die als axialer Sitz für den Schraubenkopf 17 bestimmt ist. Sodann weist die Bodenfläche 13 des Kolbens 10 ein System von radial verlaufenden, schlitzförmigen Vertiefungen 20 auf, welche an der Entlüftungs­bohrung 15 münden und dadurch mit den Längsnuten 18 in dieser Bohrung kommunizieren. Der Kolben 10 kann zweckmässigerweise eine Anzahl am Kolbenboden 23 angeformter, radialer Rippen 21 aufweisen. Diese bilden eine die Dichtfläche 19 umgebende Ver­tiefung 22, welche den Schraubenkopf 17, wenn er festgezogen ist, aufnimmt.As can be seen above all from FIGS. 2 and 3, the vent hole 15 has e.g. four longitudinal grooves 18, which run along the screw shaft 16, but outside the same. The longitudinal grooves 18 are surrounded by an annular sealing surface 19 (e.g. an annular bead) on the outside of the piston 10, which is intended as an axial seat for the screw head 17. The bottom surface 13 of the piston 10 then has a system of radially extending, slot-shaped depressions 20 which open at the vent hole 15 and thereby communicate with the longitudinal grooves 18 in this hole. The piston 10 can expediently have a number of radial ribs 21 formed on the piston head 23. These form a recess 22 surrounding the sealing surface 19, which receives the screw head 17 when it is tightened.

Es sei angenommen, dass bei aufrechtstehender Kartusche 1 die Füllmasse von unten durch die offene Mündung 4 eingeführt wird und im Zylinder 3 ansteigt, während der Förderkolben 10 sich zweckmässigerweise noch ausserhalb des Zylinders befindet. Der Füllvorgang kommt zum Stillstand, wenn eine bestimmte Menge der Füllmasse, abgemessen von einer Dosiervorrichtung in der Füllstation (nicht dargestellt), sich im Zylinder 3 befindet, worauf die Mündung 4 verschlossen wird. Anschliessend wird der Förderkolben 10 von oben in den Zylinder 3 eingesetzt - vorzugs­weise mit vormontierter, aber noch nicht festgezogener Schraube 16, 17 (Fig. 1) - und so weit nach unten gegen die Füllmasse 2 gedrückt, bis sämtliche Luft unter dem Kolben durch die Längs­nuten 18 ausgetreten ist. Die vollständige Entlüftung mit voll­flächiger Berührung der Bodenfläche 13 durch die Füllmasse ist deutlich spürbar am stark zunehmenden Widerstand gegen das Ein­schieben des Kolbens in dem Augenblick, wo die Füllmasse durch die engen Nuten 18 gepresst wird, und schliesslich kann auch leicht visuell festgestellt werden, wenn die Masse oben aus den Nuten 18 auszutreten beginnt. Daraufhin wird die Schraube festgezogen, wobei der Kopf 17 an der Dichtfläche 19 anliegt und sämtliche Längsnuten 18 verschliesst. Das Festziehen der Schraube erfolgt mit nur geringer Krafteinwirkung auf den Kol­ben und ohne nennenswerte Volumenverdrängung im Innern der Kar­tusche. Die festgezogene Schraube bildet während dem Vertrieb und der Lagerung der gefüllten Kartusche einen dichten, zuver­lässig gesicherten Verschluss. Wenn zwecks Verarbeitung des Kartuscheninhalts der Kolben 10 durch den Stössel eines Austrag­gerätes (nicht dargestellt) vorgeschoben und der Inhalt durch die Mündung 4 ausgepresst wird, bleibt der versenkte Schrauben­kopf 17 (Fig. 3) durch den erwähnten Stössel unberührt.It is assumed that when the cartridge 1 is upright, the filling compound is introduced from below through the open mouth 4 and rises in the cylinder 3, while the delivery piston 10 is expediently still outside the cylinder. The filling process comes to a standstill when a certain amount of the filling mass, measured by a metering device in the filling station (not shown), is in the cylinder 3, whereupon the mouth 4 is closed. The delivery plunger 10 is then inserted into the cylinder 3 from above - preferably with a preassembled but not yet tightened screw 16, 17 (FIG. 1) - and pressed down against the filling compound 2 until all the air under the plunger passes through the Longitudinal grooves 18 has emerged. The complete ventilation with full surface contact of the bottom surface 13 by the filling compound is clearly noticeable in the strongly increasing resistance to the pushing in of the piston at the moment when the filling compound is pressed through the narrow grooves 18, and finally can also be easily visually determined when the Mass begins to emerge from the grooves 18 above. The screw is then tightened, the head 17 abutting the sealing surface 19 and closing all the longitudinal grooves 18. The screw is tightened with only a small amount of force on the piston and without any significant volume displacement inside the cartridge. The tightened screw forms a tight, reliably secured closure during distribution and storage of the filled cartridge. If, for the purpose of processing the cartridge content, the piston 10 is pushed through the plunger of a discharge device (not shown) and the contents are pressed out through the mouth 4, the countersunk screw head 17 (FIG. 3) remains unaffected by the mentioned plunger.

Für den oben beschriebenen Entlüftungsvorgang wird eine einge­füllte Flüssigkeit mit ebener Niveaufläche 5 bei der vorliegenden Gestalt der Bodenfläche 13 kaum Schwierigkeiten bieten: Sie wird den Kolben 10 zuerst am Rand berühren und dann stetig ent­lang der Bodenfläche 13 bis zur Stelle 14 und dann in die Boh­rung 15 vordringen und dabei die Luft verdrängen. Eine dick­flüssige Füllmasse 2 mit "haufenförmiger", unregelmässiger Ober­fläche 6 dagegen wird im allgemeinen die Bodenfläche 13 zuerst an andern Stellen berühren (und zwar oft, wie bei der dargestell­ten Haufenbildung in einem zentralen Bereich), wobei sich noch Luft radial ausserhalb befindet. In diesem Fall ist dank den schlitzförmigen Vertiefungen 20 dennoch die vollständige Ent­lüftung gewährleistet. Dies ist besonders aus der stark ver­grösserten Fig. 5 erkennbar: Dank dem schmalen, jedoch relativ tiefen Querschnitt der Schlitze 20 kann radial ausserhalb den Berührungsstellen befindliche, "eingeschlossene" Luft dennoch entweichen, da gemäss Fig. 5 die Füllmasse 2 infolge ihrer Vis­kosität und dem noch praktisch drucklosen Zustand zunächst nur geringfügig in den Schlitzquerschnitt eindringt, d.h. die Schlitze noch offen hält, bis die gesamte Bodenfläche 13 von der Füllmasse berührt wird.For the venting process described above, a filled liquid with a level surface 5 will hardly pose any difficulties in the present shape of the bottom surface 13: it will first touch the piston 10 at the edge and then continuously along the bottom surface 13 to the point 14 and then into the bore 15 penetrate while displacing the air. A viscous filling compound 2 with a "heap-shaped", irregular surface 6, on the other hand, will generally first touch the bottom surface 13 at other points (and often, as in the illustrated heap formation in a central area), air still being radially outside. In this case, the complete ventilation is still ensured thanks to the slot-shaped recesses 20. This can be seen particularly from the greatly enlarged FIG. 5: thanks to the narrow, but relative deep cross section of the slots 20, "trapped" air located radially outside the contact points can nevertheless escape, since, according to FIG until the entire bottom surface 13 is touched by the filling compound.

Im übrigen kann beim Füllen der Kartusche auch so vorgegangen werden, dass bei noch nicht in den Zylinder 3 eingesetztem För­derkolben 10 der Kartuscheninhalt von oben in abgemessener Menge eingefüllt wird (nicht dargestellt). Der Kolben wird anschlies­send mit noch nicht oder nicht vollständig eingedrehter Schraube in den Zylinder 3 eingesetzt und gegen die Füllmasse 2 gedrückt. Die vollständige Entlüftung durch Andrücken des Kolbens 10 und das Verschliessen durch Festziehen der Schraube erfolgt dann wie oben beschrieben.Moreover, when filling the cartridge, the procedure can also be such that when the delivery piston 10 is not yet inserted into the cylinder 3, the contents of the cartridge are filled in from above in a measured amount (not shown). The piston is then inserted into the cylinder 3 with the screw not yet or not fully screwed in and pressed against the filling compound 2. The complete ventilation by pressing the piston 10 and the closing by tightening the screw is then carried out as described above.

Wie leicht einzusehen ist, lässt die beschriebene Gestaltung des Förderkolbens eine besonders zuverlässige und rationelle Entlüftung des Kartuschenzylinders nach dem Einfüllen zu. Dabei können die Vorgänge Abfüllen, Entlüften und Verschliessen auch ohne besondere Schwierigkeiten automatisiert werden.As can easily be seen, the design of the delivery piston described allows particularly reliable and efficient venting of the cartridge cylinder after filling. The processes of filling, venting and closing can also be automated without any particular difficulties.

Claims (3)

1. Austragkartusche mit Vorratszylinder (1) und darin abdichtend verschiebbarem Förderkolben (10), dessen dem Kartu­scheninhalt (2) zugekehrte Bodenfläche (13) radial verlaufende, schlitzförmige Vertiefungen (20) aufweist, die in einer von der Mitte der Bodenfläche (13) nach aussen führenden, verschliess­baren Entlüftungsbohrung (15) münden, dadurch gekennzeichnet, dass die genannte Bodenfläche (13) des formsteifen Förderkolbens (10) vom Kolbenrand zur Entlüf­tungsbohrung (15) hin stetig vertieft ist und dass in der Ent­lüftungsbohrung (15) eine Verschlussschraube (16, 17) sitzt, entlang deren Schaft (16) mindestens eine Längsnut (18) in der Bohrung (15) verläuft, wobei die Längsnuten (18) an der Aussen­seite des Kolbens (10) von einer ringförmigen Dichtfläche (19) umgeben sind, welche als axialer Sitz für den Schraubenkopf (17) bestimmt ist.1. Discharge cartridge with storage cylinder (1) and sealingly displaceable delivery piston (10), the bottom surface (13) of which faces the cartridge content (2) has radially extending, slot-shaped depressions (20) in one of the center of the bottom surface (13) closable vent hole (15) leading to the outside, characterized in that said bottom surface (13) of the dimensionally stable delivery plunger (10) is continuously deepened from the piston edge to the vent hole (15) and in that a screw plug (16, 17) sits, along the shaft (16) of which at least one longitudinal groove (18) runs in the bore (15), the longitudinal grooves (18) on the outside of the piston (10) being surrounded by an annular sealing surface (19) which, as axial seat for the screw head (17) is intended. 2. Austragkartusche nach Anspruch 1, dadurch gekennzeich­net, dass der Förderkolben (10) an seiner Aussenseite eine die ringförmige Dichtfläche (19) umgebende Vertiefung (22) zur ver­senkten Aufnahme des Schraubenkopfes (17) aufweist.2. Discharge cartridge according to claim 1, characterized in that the delivery piston (10) has on its outside a recess (22) surrounding the annular sealing surface (19) for the recessed reception of the screw head (17). 3. Austragkartusche nach Anspruch 1, dadurch gekennzeich­net, dass der Förderkolben (10) zum Vorratszylinder (1) durch eine in eine Ringnut (11) eingelegte Ringdichtung (12) abge­dichtet ist.3. Discharge cartridge according to claim 1, characterized in that the delivery piston (10) to the supply cylinder (1) is sealed by an annular seal (12) inserted into an annular groove (11).
EP89108449A 1988-06-03 1989-05-11 Dispensing cartridge with a supply cylinder and an expulsion piston Expired - Lifetime EP0344491B1 (en)

Applications Claiming Priority (2)

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CH2110/88 1988-06-03
CH211088 1988-06-03

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US5085350A (en) * 1990-03-16 1992-02-04 Kabushiki Kaisha Top Pump assembly with container for storing liquid in isolation from ambient air
EP0497739A2 (en) * 1991-01-29 1992-08-05 Wilhelm A. Keller Dispensing cartridge with a supply cylinder and an expulsion piston
DE9315032U1 (en) * 1993-10-04 1994-01-27 Schneider, Falk Walter, 51580 Reichshof Pistons for pumping low to high viscosity liquids from cartridges
US5316186A (en) * 1991-08-26 1994-05-31 Eugen Prestele Fully dischargeable cartridge for paste-like substances
EP1514611A2 (en) 2003-09-10 2005-03-16 Heraeus Kulzer GmbH Closing piston for catridges having venting and barrier properties
DE102008000841A1 (en) 2008-03-26 2009-10-01 Adcatec Gmbh Cartridge and piston with ventilation device
WO2012055921A1 (en) * 2010-10-26 2012-05-03 Kettenbach Gmbh & Co. Kg Piston and cartridge arrangement having said piston
US9844796B2 (en) 2005-10-14 2017-12-19 3M Innovative Properties Company Plunger and plunger assembly for a cartridge, system for storing a substance, and method of filling and sealing a substance in a delivery system

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US5085350A (en) * 1990-03-16 1992-02-04 Kabushiki Kaisha Top Pump assembly with container for storing liquid in isolation from ambient air
EP0463991A1 (en) * 1990-06-21 1992-01-02 Wilhelm A. Keller Dispensing cartridge with a supply cylinder and an expulsion piston
US5178305A (en) * 1990-06-21 1993-01-12 Keller Wilhelm A Dispensing cartridge with storage cylinder and dispensing piston having a closure sealed vent bore
EP0497739A2 (en) * 1991-01-29 1992-08-05 Wilhelm A. Keller Dispensing cartridge with a supply cylinder and an expulsion piston
EP0497739A3 (en) * 1991-01-29 1993-03-10 Wilhelm A. Keller Dispensing cartridge with a supply cylinder and an expulsion piston
US5316186A (en) * 1991-08-26 1994-05-31 Eugen Prestele Fully dischargeable cartridge for paste-like substances
DE9315032U1 (en) * 1993-10-04 1994-01-27 Schneider, Falk Walter, 51580 Reichshof Pistons for pumping low to high viscosity liquids from cartridges
EP1514611A2 (en) 2003-09-10 2005-03-16 Heraeus Kulzer GmbH Closing piston for catridges having venting and barrier properties
US9844796B2 (en) 2005-10-14 2017-12-19 3M Innovative Properties Company Plunger and plunger assembly for a cartridge, system for storing a substance, and method of filling and sealing a substance in a delivery system
US10279935B2 (en) 2005-10-14 2019-05-07 3M Innovative Properties Company Plunger and plunger assembly for a cartridge, system for storing a substance, and method of filing and sealing a substance in a delivery system
DE102008000841A1 (en) 2008-03-26 2009-10-01 Adcatec Gmbh Cartridge and piston with ventilation device
DE102008000841B4 (en) * 2008-03-26 2014-04-30 Adcatec Gmbh Cartridge and piston with ventilation device
WO2012055921A1 (en) * 2010-10-26 2012-05-03 Kettenbach Gmbh & Co. Kg Piston and cartridge arrangement having said piston
US9797511B2 (en) 2010-10-26 2017-10-24 Kettenbach Gmbh & Co Kg Piston and cartridge arrangement having said piston

Also Published As

Publication number Publication date
EP0344491B1 (en) 1992-12-23
JPH0631112B2 (en) 1994-04-27
DE58903082D1 (en) 1993-02-04
JPH0232985A (en) 1990-02-02
US4951848A (en) 1990-08-28

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